The Canton Railroad dispute with Maryland involving whether the state franchise tax on railroad activities in the port of Baltimore violated the Import-Export or Commerce Clauses of the Constitution led to the Supreme Court case Canton Railroad Company v. Rogan, 340 U.S. 511 (1951).
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A similar piece (including the crenelations) was found at the Etowah site in Georgia, but it is described as a "rattle" and it slightly more resembles the severed heads held by figures on the Rogan plates found at the site by John P. Rogan in the 1880s.
Rogan tested seven other archaeological sites in Georgia in Bartow, White, Habersham, Forsyth, Rabun, Elbert, and McIntosh counties.